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Abstract

We propose and demonstrate a wavelength-division-multiplexed passive
optical network providing both unicast and broadcast services using an offset
polarization multiplexing technique. The downstream differential phase-shift
keying (DPSK)-formatted unicast and broadcast signals are offset polarization-multiplexed
at the central office and demultiplexed and detected at the optical network
units without resorting to any polarization tracking. A portion of the offset
polarization-multiplexed downstream signals is fed into a polarization-sensitive
weak-resonant-cavity Fabry–Perot laser diode for upstream remodulation
without any polarization control. Successful transmissions of 10-Gb/s downstream
unicast and broadcast DPSK signals as well as 2.5-Gb/s upstream ON–OFF
keying signal over a 20-km standard single-mode fiber are experimentally demonstrated.
The robustness of the proposed scheme against polarization fluctuation along
the link, relative bit delay between the unicast and broadcast signals, frequency
deviation of the downstream signals from the delay interferometer (DI), and
imperfection of the DI is investigated.

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